Improvement in iron truss-bridges



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Iron Truss Bridges.

NO 50152. Patented April28,1874.

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Witnesses.

En STATES PATENT OFFICE.

DAVID HAMMOND AND JOB ABBOTT, OF CANTON, OHIO.

IMPRVEMENT IN IRON TRUSS-BRIDGEYS.

Specitication forming part of Letters Patent No. 150,152, dated April 28, 1874; application filed February 14, 1874. l

CAsE A.

To all whom t may concern:

Be it known that we, DAVID HAMMOND and JOB AB]3OT'r,orn Oanton,in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Iron Truss- Bridges; and that the following is a full, clear, and exact specication thereof, which will enable others skilled in the art to make and use the said invention.

Our invention relates to the construction of a substantial and economical wrought -iron highway truss-bridge, to be used in place of' the arch-bridge for short spans of from twenty to eighty feet, or thereabout, thereby avoiding the squatty appearance of the arch-bridge for such spans, and giving a good guard in the girders for each side ofthe track. To this end the invention claimed in this application consists in the construction of a truss top chord formed of a rolled channel-bar, having its web laid horizontal and its flan ges projecting downward, and having riveted thereon a rolled T- bar, having its head riveted to the channelweb and its leg projecting upward, these parts combined forming a solid chord ot' great compressive capacity, which is easily manufactured, and which does not retain the rain or moisture falling on it. Said invention also consists in the construction of a truss-post of a rolled I-beam, having its web cut awayto pass the chord-pin, and to receive the diagonals, if desired, the chord-pin tting in holes in the beam-heads, and forming an end bearing for the post, thus affording a solid post of great compressive capacity, with very simple chord and diagonal attachments, as is hereinafter more fully. shown. Said invention also consists in the construction of an end truss-post ot' a rolled :l2-beam, having its end rounded off and Y and 5, the web of the post C being cut away iitted in a concave seat in the girder-shoe, the shoe, post end, and chords bein g united byapin passing' through the walls of the shoe, chord ends, and heads of the beam-post, thus allowing the shoe to adjust itself to the abutmenttop, and securing all the parts firmly to each other, as is hereinafter more fully shown. Said invention also consists of awrought-iron trussgirder with a top chord of rolled channel-bar,

with its web horizontal and ilanges projecting downward, (either with or without a rolled T-ba-r thereoin) posts of rolled I-beam, lower chords of plate-iron placed edgewise, and diagonals, having eyes at their lower end, connected to a pin, which transmits the poststrains to the diagonals, and the diagonal strains to the lower chords, these several parts being arranged and united by bolts and an gle-` A is the top chord, arranged with its webin a horizontal position, land its iian ges a a projecting downward. B is a rolled T-bar, having' its head riveted to the web ofchannel-bar A, and its leg projecting upward, the object being to increase the chord-section and bending diameter without forming a trough or receptacle for rain. O is the end post of rolled :1j-beam iron, having its head bearing under the end of the channel-chord A by proper fitting, or through a cast-head, and having its lower end a rounded oft', as shown by dotted lines in Fig. 5. The truss-shoe H is made with side walls h h, between which is a concave seat, (shown in Fin'. 5,) upon which the rounded end u of the post C rests. The chords F F are of plate-iron, and their ends iit between the shoe-walls h h and the post C, andall the parts are united by the pin lz, which passes .through the shoe-walls h h, chords F F, heads of post O, and eye of counter-rod E, when used as shown in Figs. l, 2,

at the bottom to admit the counter-eye and pass the pin, as shown. mediate truss-posts of rolled 1E-beam iron, which are fitted either directly or with a cast head against the channel-chord A at their ends. Their lower ends pass down between the chords F F, and have the web cut away, as shown at d in Fin'. 3, to admit the eyes on D D are the inter-- 2 mene the diagonal and counter rods E, or simply the eye on the counter-rod, and to pass the pin a, which runs through the heads of the post D and the diagonal and counter eyes, as shown in Fig. 3, and fits into anoteh in the chords F, as shown in Fig. 1, thus acting to support the post, and to transmit the post strain to the diagonals and counters, and the diagonal and counter strains to the lower chords. The bolt j' passes through the chords F F and heads of post D, thus securing these posts closely together. If preferred, the diagonalrods E can be placed between the chords F and posts D, in which ease thimbles should be placed on the bolts j', to leave the desired space between the chords and posts. rEhe diagonale and counters E run up through the channel-bar A and through angle-blocks b, which are fitted between the pieces B of the top T-bar. The end angle-bloek b usually made with a flange to lit down over the end of the channel-chord A, and makes a neat end finish, as shown in Fig. 4. rlhe brace-beams G are lnade of rolled beain iron, and fit down on the chord F, with their heads resting in notches t cutin the heads otposts D, as shown inFig. l. These beams are clamped to the posts D by bolt m. (Shown in Fig. 3.) These beams are clamped to the posts D by bolt m, (shown in Fig. 3,) and, being thus notched and bolted to the truss-posts, aid materially in holding the girders against side motion, while they are thus brought in far enough to allow the diagonal rods E to pass up from the pin c without striking the beam, as shown in Fig. l. The side brace g is run from the channel-bar A down to a thiinble se cured on the end of beam G, to further aid in holding the girders from side motion.

YVhat we claim herein as new and of our invention, and desire to secure by Letters Patent, is

1. Atop chord for trusses, consisting of a rolled channel-bar arranged with its lian ges projecting downward, and havin g a rolled T- bar riveted to the web thereof, substantially as and for the purpose speeied.

2. A truss-post of rolled :l;beam form, having its web cut away at the lower end to pass the chord-pin and admit the counter-eye, substantially for the purpose specified. y

3. Thercombination of the truss-shoe H with side walls h 11 post C, with rounded lower end, chords F F, and pin fi, the several parts being arranged and united sul'istantially as and for the purpose speeiiied.

4. A wrought-iron truss-girder constructed with a top chord of rolled channel-iron, arranged with its anges projecting downward, posts of rolled :jg-beam, lower chords ot' plateiron placed edgewise, and diagonal and counter rods having eyes at their lower ends secured on a pin, whieh transmits the post strain s to the diagonals and counters, and the diag onal and counter strains to the lower chords, the several parts being arranged substantially` as and for the purpose specified.

As evidence of the foregoing witness our hands this 30th. day of January, A. D. 1874.

DAVID HAMMOND.

Nitnessesz J OB ABBOTT.

WM. MCKINLEY, J r., A. MCKINLEY. 

